| 摘要 |
PURPOSE:To obtain the titled film that is excellent in optical properties such as see-through and transparency, can be stretched favorably, and produces fumes less and smears rolls less when it is calendered, by incorporating a specific quantity of a sorbitol derivative that can serve as a crystallizing nucleator into a crystalline polypropylene. CONSTITUTION:100pts.wt. crystalline polypropylene (preferably a crystalline propylene monopolymer of an isotactic polymer and/or a copolymer of propylene with another alpha-olefin that has a melt index of 1-4) and 0.05-1.0pts.wt. sorbitol derivative[preferably dibenzylidenesorbitol, 1.3, 2.4-di(methylbenzylidene) sorbitol]that can serve as a crystallizing nucleator are mixed, and the mixture is melted and calendered preferably at 200-300 deg.C, and is stretched at 120-160 deg.C so that the aimed film whose diffused transmission light intensity is 6% or below and haze is 1% or below is obtained. |
